6061 aluminum alloy is a precipitation hardening aluminum alloy, containing magnesium and silicon as its major alloying elements. Originally called "Alloy 61S," it was developed in 1935. It has good mechanical properties and exhibits good weldability. It is one of the most common alloys of aluminum for general purpose use.

6061 aluminum alloy is commonly available in pre-tempered grades such as 6061-O (annealed) and tempered grades such as 6061-T6 (solutionized and artificially aged) and 6061-T651 (solutionized, stress-relieved stretched and artificially aged).

The alloy composition of 6061 is:
Silicon minimum 0.4%, maximum 0.8% by weight
Iron no minimum, maximum 0.7%
Copper minimum 0.15%, maximum 0.40%
Manganese no minimum, maximum 0.15%
Magnesium minimum 0.8%, maximum 1.2%
Chromium minimum 0.04%, maximum 0.35%
Zinc no minimum, maximum 0.25%
Titanium no minimum, maximum 0.15%
Other elements no more than 0.05% each, 0.15% total
Remainder Aluminum (95.85%–98.56%)

Different from aluminum alloy 7020>, the mechanical properties of 6061 depend greatly on the temper, or heat treatment, of the material. Young's Modulus is 10×106 psi (69 GPa) regardless of temper. Annealed 6061 (6061-O temper) has maximum tensile strength no more than 18,000 psi (125 MPa), and maximum yield strength no more than 8,000 psi (55 MPa). The material has elongation (stretch before ultimate failure) of 25–30%. T4 temper 6061 has an ultimate tensile strength of at least 30,000 psi (207 MPa) and yield strength of at least 16,000 psi (110 MPa). It has elongation of 16%.

6061 is commonly used for the following: construction of aircraft structures, such as wings and fuselages, more commonly in homebuilt aircraft than commercial or military aircraft. 2024 alloy is somewhat stronger, but 6061 is more easily worked and remains resistant to corrosion even when the surface is abraded, which is not the case for 2024, which is usually used with a thin Alclad coating for corrosion resistance; yacht construction, including small utility boats; automotive parts, such as wheel spacers; the manufacture of aluminum cans for the packaging of foodstuffs and beverages; SCUBA tanks.

aluminiumsupplier.com.cn formerly known as Guangdong Xingfa Aluminum Profile Factory was established in 1984. As one of the earliest enterprises engaged in aluminum profile in Mainland China, the Company has become a famous and large-scaled enterprise specialized in production of aluminum profiles for both architecture and industry, with its yearly capacity of 150,000 tons. The Company is the production base for aluminum alloy designated by the Ministry of Construction of China, and it was awarded "No.1 of Top-Ten National Aluminum Profile Enterprises".

Aluminum alloys are alloys in which aluminum is the predominant metal. The typical alloying elements are copper, magnesium, manganese, silicon and zinc. There are two principal classifications, namely casting alloys and wrought alloys, both of which are further subdivided into the categories heat-treatable and non-heat-treatable.

Aluminum alloys with a wide range of properties are used in engineering structures. Alloy systems are classified by a number system or by names indicating their main alloying constituents. 6061 aluminum alloy is a precipitation hardening aluminum alloy, containing magnesium and silicon as its major alloying elements. Selecting the right alloy for a given application entails considerations of its tensile strength, density, ductility, formability, workability, weldability, and corrosion resistance, to name a few. A brief historical overview of alloys and manufacturing technologies is given in Ref. Aluminum alloys are used extensively in aircraft due to their high strength-to-weight ratio. On the other hand, pure aluminum metal is much too soft for such uses, and it does not have the high tensile strength that is needed for airplanes and helicopters.
 
Aluminum also is subject to internal stresses and strains when it is overheated; the tendency of the metal to creep under these stresses tends to result in delayed distortions. Aluminum alloys such as aluminum alloy 7020 are widely used in engineering structures and components where light weight or corrosion resistance is required. For example, the warping or cracking of overheated aluminum automobile cylinder heads is commonly observed, sometimes years later, as is the tendency of welded aluminum bicycle frames to gradually twist out of alignment from the stresses of the welding process. Thus, the aerospace industry avoids heat altogether by joining parts with adhesives or mechanical fasteners. Adhesive bonding was used in some bicycle frames in the 1970s, with unfortunate results when the aluminum tubing corroded slightly, loosening the adhesive and collapsing the frame.

Aluminum's intolerance to high temperatures has not precluded its use in rocketry; even for use in constructing combustion chambers where gases can reach 3500 K. The Agena upper stage engine used a regenerative cooled aluminum design for some parts of the nozzle, including the thermally critical throat region; in fact the extremely high thermal conductivity of aluminum prevented the throat from reaching the melting point even under massive heat flux, resulting in a reliable lightweight component.

aluminiumsupplier.com.cn formerly known as Guangdong Xingfa Aluminum Profile Factory was established in 1984. As one of the earliest enterprises engaged in aluminum profile in Mainland China, the Company has become a famous and large-scaled enterprise specialized in production of aluminum profiles for both architecture and industry, with its yearly capacity of 150,000 tons. The Company is the production base for aluminum alloy designated by the Ministry of Construction of China, and it was awarded "No.1 of Top-Ten National Aluminum Profile Enterprises".

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